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Settings for Basic Authentication 
If you use Basic Authentication to log on to SAP Web Application Server, you can choose either a standard SAP user or an Internet user:
· The default SAP user is the user name that is entered in transaction SU01.
· The Internet user is the alias name, which can be longer than the regular SAP user name. The alias can also be set in transaction SU01.
Depending on the settings, your entry in the HTTP dialog box for Basic Authentication is interpreted as either a user name or an alias.
If you want to change the user type for the Basic Authentication logon procedure in a service or service node, proceed as follows:
1. In transaction SICF, double-click the required service or service node.
2. Choose Change.
3. Under Service Data ® Basic Authentication, choose Standard SAP User or Internet User.

When you make this setting in a service node, it is passed on to all services under this node.
4. Save your data.
